Northern Circuit or Lemosho - which one to book?

I want to go to Kilimanjaro in Jan 2014 (my second visit after not making the summit on the Machame route a few years ago). I'm really liking the idea of having maximum time to acclimatise so am trying to decide between the Northern Circuit and Lemosho routes. In Jan the Northern Circuit route cost £500 more than the Lemosho route which for 1 extra day seem a lot, so would you pay £500 for an extra day on the mountain? It would mean making a few extra sacrifices over the next couple of months but I want to get a trip that allows me to enjoy the mountain and gives me the best chance of making the summit.

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